time, the state department urged all nonessential personnel to leave on commercial flights.thef.b.i. hasopened an investigation and is sending agents to sift through the wreckage for evidence. and at the same time the u.s. is increasing its surveillance over libya, including the use of those unmanned drones. in addition, scott, the navy is positioning two destroyers armed with cruise missiles off the coast of libya. bottom line: this is a terrorist hunt. >> pelley: david, thank you. this is the first time a u.s. ambassador has died in the line of duty in more than 30 years. at the white house this morning, the president said this. >> the united states condemns in the strongest terms this outrageous and shocking attack. and make no mistake, we will work with the libyan government to bring to justice the killers who attacked our people. >> pelley: christopher stevens is only the sixth u.s. ambassador in american history to be killed by terrorists. it was a shock at the state department where secretary of state hillary clinton spoke earlier. >> today many americans are asking-- indeed